Flush toilet

ABSTRACT

The invention relates to a flush toilet with a toilet unit comprising a toilet bowl, and a flush water outlet via which flush water is delivered into the toilet unit, wherein the flush water outlet is arranged asymmetrically relative to an imaginary centre line, which extends essentially centrally from a front end of the toilet unit facing a user during the flushing operation to an opposite rear end of the toilet unit, in a rear lateral region, in particular in a rear lateral corner region, of the toilet bowl.

The invention relates to a flush toilet according to the preamble of claim 1.

Flush toilets have been known for some considerable time, wherein the given toilet is provided with a flush. The flushing of a flush toilet has two main functions. On the one hand, the flushing is intended to serve to flush the entire inner surface of the toilet bowl rendering it clean and on the other hand solids and sewerage are intended to be removed from the siphon by the flushing, or by means of the flush.

The features of a functionally successful flush toilet consist in cleaning a maximum inner surface of the toilet bowl and removing solids and water from the siphon with a maximum flushing force, wherein both the cleaning of the toilet bowl surface and the flushing of the siphon should take place splash-free. At the same time, however, design features such as a hygienic surface, a cleaning-friendly design without dead corners and quiet flushing are also desired. These properties are often antagonistic and compromises have to be made in order to achieve a required balance between functionality, performance, design and producibility.

The size, shape and design of a toilet bowl have a substantial influence here, since, in the case of a large inner surface of the toilet bowl to be cleaned, the inflowing water jet has to be deflected for logical reasons and distributed in the bowl, so that the entire bowl surface is covered, or acted upon by flush water.

For this purpose, a water distributor is often used, which is arranged between the water inflow and the toilet bowl and divides the water into a plurality of sub-flows in order to clean the toilet bowl. In the case of conventional toilets with a rim, such a water distributor is located in the middle of the rear wall of the toilet and is constituted structurally as part of the rim, although in its physical dimensions it can also extend locally downwards and/or out of the rim into the toilet. When use is made of such a water distributor, the flush water is conducted around the two concave inner sides of the toilet bowl, wherein, depending on the water distributor, some water is conducted directly downwards into the siphon.

Such water distributors are also found in modern “rimless” toilets, wherein these water distributors are arranged in the middle of the upper rear wall of the bowl. Since these “rimless” toilets do not have a rim, the water distributors used with “rimless” toilets are usually arranged in such a way that these water distributors project into the toilet bowl, so that the exiting water jets can be directed themselves onto the bowl, or the bowl surface. The water leaves the distributor through a series of outflow holes or slots, which are provided for example in a bowl.

On account of the clearer design of “rimless” toilets, components such as a water distributor in such a “rimless” toilet usually seems like a foreign body which projects into the toilet bowl, which severely disrupts the desired aesthetics of a clear line design, in particular in the toilet bowl.

It is also problematic from the hygiene standpoint that the water distributor itself and in particular the surfaces of the toilet bowl in the immediate vicinity at the side of and/or beneath the distributor are scarcely cleaned by the flush water flows delivered by the water distributor. This is all the more problematic since this central rear position of the toilet bowl is very susceptible to soiling during use of the toilet, since it is located directly behind the user when the toilet is used. Such standard water distributors thus exhibit a very large area which is susceptible to soiling, but which remains uncleaned during flushing due to reasons of design and arrangement. This is unhygienic, unsightly and undesired.

More recent flushing methods work with a swirling water flow pattern, wherein the inflow water is introduced tangentially along the toilet bowl surface and swirls in a spiral-like manner in the toilet bowl. This differs from the traditional method, wherein water flows at the left and right around the inner surface of the toilet bowl, then meeting in the middle at the front on the user side. The force of gravity also leads to the flush water losing its impetus when it moves in a circular motion in the toilet bowl and to it losing height, which makes it difficult to achieve a completely circumferential circulation in the toilet bowl, so that the flush water returns to the starting point, i.e. the water distributor, and pours over the water distributor and/or its surroundings, in order to flush these areas of the toilet. The soiling problem of the water distributor and the problem of cleaning the distributor are also not solved, therefore, with these previously known so-called-called vortex flushers.

A further problem also consists in the fact that, especially in the case of “rimless” toilets, a relatively large outflow hole has to be provided in the surface of the toilet bowl for the delivery of flush water. Since this outflow hole is located in the rear part of the toilet bowl, it is arranged precisely in the field of vision of a user of the toilet, which on the one hand is very unsightly aesthetically, since unavoidable soiling usually accumulates at this outflow hole, and on the other hand also often leads to the water, usually flowing out with pressure, splashing on account of the soiling.

A further method for flushing a toilet bowl is a use of a plurality of individual water distributors, which are arranged around an upper rim of the toilet. In this regard, different distributor models are known, which however all have a complex geometry and therefore complicated production in common, which is very disadvantageous. With such toilets with a plurality of individual water distributors, at least one of the distributors usually has to be arranged in the front part of the bowl, so that a flushing direction of the flush water is directed backwards. To do this, the inflowing water, which is fed from behind to the toilet, must make a 180° turn, in order to change the direction such that the flow direction of the flush water is directed backwards. Such a sharp turn close to the water outlet in the front region of the toilet bowl, however, reduces the water pressure considerably and thus reduces the available flushing force.

A further problem of previous flushing systems also consists in the fact that a water inlet into the siphon is difficult to control. This applies especially when use is made of more than one water outflow hole and/or an additional nozzle hole in the siphon.

Examples of such flushing systems are described for example in EP 2 604 761 A1, EP 3 054 061 A1, EP 1 847 656 B1, WO 2017/006903 A1, WO 2016/143 029 A1, WO 2015/143 391 A1, EP 3 119 946 A1, EP 2 233 651 B1, EP 2 203 608 B1 and WO 2014/123 494 A1.

The problem underlying the invention is to solve the aforementioned problems and to provide a flush toilet which enables an optimised and hygienic flushing of an inner surface of the toilet bowl and the siphon.

This problem is solved by a flush toilet according to claim 1.

In particular, the problem is solved by a flush toilet with a toilet unit comprising a toilet bowl and a flush water outlet, via which flush water can flow into the toilet unit, wherein the flush water outlet is arranged asymmetrically relative to an imaginary centre line, which extends essentially centrally from a front end of the toilet unit facing a user during the flushing operation to an opposite essentially central rear end of the toilet unit.

An essential point in the invention consists in the fact that the flush water outlet is arranged asymmetrically on the toilet unit, so that it is possible to deliver flush water through the flush water outlet asymmetrically relative to an imaginary centre line, which extends essentially centrally from a front end of the toilet unit facing a user during the flushing operation to an opposite rear end of the toilet unit. An important point of the invention also consists in the fact that, as a result of the asymmetrical arrangement of the flush water outlet, it is possible to flush the inner surface of the toilet bowl in such a way that a part of the flush water is not conducted, as previously, directly from the flush water outlet in the direction of the siphon, but first via a side wall at the inner side of the toilet bowl, so that a circular flow arises, which wets and therefore cleans the inner surface of the toilet bowl with flush water better than with a central provision of the flush water outlet at the rear side of the toilet bowl inner side.

Moreover, the asymmetrical arrangement of the flush water outlet prevents, in an extremely advantageous and at the same time extremely straightforward manner, the flush water outlet from being soiled during use of the toilet according to the invention, since the flush water outlet is no longer arranged in the toilet bowl directly to the rear of a user.

For this purpose, the flush water outlet is arranged according to the invention in a rear lateral region, in particular a rear lateral corner region, of the toilet bowl, wherein the flush water is delivered not downwards, but in an essentially horizontal direction tangentially into the toilet bowl. As a result of the tangential delivery of the flush water, the flush water spins in the form of a circular flow in the toilet bowl and flushes over a substantial part of the inner surface of the toilet bowl before the flush water then flushes and therefore cleans the siphon.

In the context of this invention, a rear lateral corner region of the toilet bowl is defined by a lateral rear region of the toilet bowl which, depending on the shape of the toilet unit, actually represents a corner, optionally a rounded corner, of the toilet bowl or a rear region of the toilet bowl which, in the toilet bowl at the level of the first flush water outlet opening, has a distance from the imaginary centre line which lies in the range from 70% to 100%, preferably 75% to 100%, and particularly preferably 80% to 100% of a maximum distance of a rear lateral inner surface of the toilet bowl from the imaginary centre line. Depending on the shape and design of the toilet bowl, the maximum distance of a rear lateral inner surface of the toilet bowl from the imaginary centre line of the toilet bowl may be different on the two sides of the centre line. In this connection, it should be pointed out that the flush water outlet in the sense of this definition does not count as a lateral inner surface of the toilet bowl.

It should be pointed out at this point that rear side wall is understood to mean the region of the toilet bowl in which a tangent drawn at the level of the lower boundary of the second flush water outlet opening to the inner wall of the toilet bowl encloses an angle with the imaginary centre line between 90° and 45°. In the context of the invention, the region of a front side wall of the toilet bowl is to be understood similarly. The region of a lateral side wall of the toilet bowl is to be understood as the region of the toilet bowl in which a tangent drawn at the level of the lower boundary of the second flush water outlet opening to the inner wall of the toilet bowl encloses an angle with the imaginary centre line between 45° and 0°, wherein an angle of 0° between the tangent and the imaginary centre line denotes a parallel course of the tangent and the imaginary centre line. In this consideration, only the angles between the drawn tangent and the imaginary centre line that lie in a range between 0° and 90° are basically considered in the context of the invention. The inner periphery of the toilet bowl is to be understood as a line at the level of the lower boundary of the second flush water outlet opening along the inner wall of the toilet bowl, which extends around the circumference of the inner wall of the toilet bowl.

According to a further particularly preferred embodiment of the invention, the flush water outlet comprises at least a first flush water outlet opening, through which flush water can be delivered in a first initial flushing direction, and at least a second flush water outlet opening, through which flush water can be delivered in a second initial flushing direction. It is thus possible to flush the toilet bowl in opposite directions, wherein flush water that is delivered through the first flush water outlet opening is initially conducted along a lateral inner side wall of the toilet bowl, and flush water that is delivered through the second flush water outlet opening initially flows along a rear inner side wall of the toilet bowl. The flush water that is conducted along the inner side wall of the toilet bowl preferably flows from a rear lateral section of the toilet bowl, particularly preferably from a “corner region” of the toilet bowl, first along the lateral wall of the toilet bowl into a front region of the toilet bowl and, following this, again in the direction of the rear wall of the toilet bowl, where the water delivered from the first flush water outlet opening then meets the flush water delivered from the second flush water outlet opening and flows in the direction of the siphon. The water delivered from the second flush water outlet opening is initially conducted not in the direction of the lateral inner wall of the toilet bowl, but in the direction of the inner rear wall of the toilet bowl, so that the water delivered from the second flush water outlet opening flows against the flush water which is delivered from the first flush water outlet opening and deflected backwards on account of the curved shape of the inner side of the toilet bowl.

According to the invention, the free cross-section of the first flush water outlet opening is larger than a free cross-section of the second flush water outlet opening, so that a first flush water quantity that is delivered from the first flush water outlet opening is greater than a second flush water quantity that is delivered from the second flush water outlet opening. According to the invention, this is particularly advantageous, since the first flush water quantity is intended to flush over a significantly larger surface area of the inner surface of the toilet bowl rendering it clean, whereas the second flush water quantity cleans only the rear back wall of the toilet bowl.

The water delivery from the first flush water outlet opening and/or the second flush water outlet opening takes place with an initial flushing direction, wherein the first and/or the second initial flushing direction extend in an essentially horizontal direction of ±0° to 5° relative to a horizontal line and the flush water is thus delivered essentially horizontally. The first initial flushing direction can if desired be directed slightly upwards, in order to counteract somewhat a gravitational effect by which the flush water is necessarily guided downwards in the direction of the siphon and thus to achieve an effect such that the first flush water flow reaches the rear part of the toilet bowl in as high a position as possible.

According to an alternative embodiment of the invention, the first initial flushing direction can also be directed slightly downwards, which may be desirable especially in the case of “rimless” toilet bowls, in order to reliably prevent splashing over the “rim”.

According to the invention, the first and the second initial flushing direction are orientated with respect to one another at an angle in the range from 20° to 170°, preferably at an angle in the range from 45° to 140°, and particularly preferably at angle in the range from 70° to 130°.

Depending on the shape of the toilet, this thus makes it possible to make settings in the optimum manner such that the first flush water flow is initially delivered tangentially along a lateral inner side wall of the toilet bowl, and the flush water that is delivered through the second flush water outlet opening flows initially and also tangentially along a rear inner side wall of the toilet bowl.

According to a further embodiment of the invention, there can be provided in the interior, i.e. at the inner surface, of the toilet bowl a ledge or a plurality of ledges and/or a shoulder or a plurality of shoulders, which act as a water guiding device, wherein the flush water exiting from the first flush water outlet opening and/or the flush water exiting from the second flush water outlet opening is conducted along a ledge arranged in the interior of the toilet bowl and/or along a shoulder arranged in the interior of the toilet bowl.

In this way, the water exiting from respective flush water outlet openings can be delivered, in particular initially, at a specific, predefined level in the toilet bowl and can be held at this level which is determined by the water guiding device. The water guiding device(s) provided according to the invention, i.e. in particular the ledge and/or the shoulder, taper from an end close to the respective flush water outlet opening to an end remote from the respective flush water outlet opening, in particular down to zero. The taper can be constituted such that the ledge or the shoulder only become narrower, so that the guiding area for the flush water becomes smaller on the ledge or the shoulder with an increasing distance from the respective flush water outlet opening. Moreover, the taper can first comprise an, optionally sharp, edge directed in the direction of the inner side of the toilet bowl, which edge is optionally constituted increasingly rounded at its inner end facing the inner side of the toilet bowl with an increasing distance from the respective flush water outlet opening. Furthermore, the ledge provided in the toilet bowl or the shoulder provided in the toilet bowl can also comprise openings, wherein the openings enable a partial discharge of the flush water guided on the ledge and/or the shoulder.

Furthermore, it should be pointed out in this connection that an at least one water guiding device constituted on the inner surface of the toilet bowl according to the invention, for example also in the form of a ledge, can also be formed and defined by the fact that the inner surface of the toilet bowl comprises a protrusion running essentially horizontally or, if desired, also in particular slightly inclined, which protrusion forms the “ledge”, wherein the protrusion has a continuous smooth course, when viewed vertically, with two turning points, at which an inner contour of the toilet bowl first transforms from a concave into a convex form and then back into a concave form.

According to a further embodiment of the invention, the “ledge” can also be formed by the fact that an inner contour of the toilet bowl first running in a concave manner in the case of an upright flush toilet, viewed in a vertical direction from top to bottom, transforms into an inner contour of the bowl running in a convex manner, which inner contour, depending on the embodiment, runs up to the siphon of the flush toilet in a continued convex manner or in a conically linear manner.

According to the invention, the water guiding device extends to a differing extent over the inner surface of the toilet bowl in the respect of first flush water outlet opening and the second flush water outlet opening, wherein the water guiding device assigned to the first flush water outlet opening preferably extends from the first flush water outlet opening over at least a tenth up to a half or almost completely along the inner periphery of the toilet bowl in the direction of the rear inner side wall of the toilet bowl and wherein the water guiding device assigned to the second flush water outlet opening preferably extends from the second flush water outlet opening over essentially an eighth up to half the length of the rear inner side wall of the toilet bowl.

According to an embodiment of the invention, it is possible that the respective water guiding device only indirectly adjoins the respective flush water outlet openings and in the case of the first flush water outlet opening already ends at a distance in a range from 5 cm to 25 cm, preferably in a range from 8 cm to 20 cm and particularly preferably in a range from 8 cm to 15 cm and in the case of the second flush water outlet opening at a distance in a range from 1 cm to 15 cm, preferably in a range from 3 cm to 12 cm and particularly preferably in a range from 3 cm to 10 cm.

According to an alternative embodiment of the invention, it is also possible that the respective water guiding device does not lie directly adjacent to a respectively assigned flush water outlet opening, but rather that the flush water exiting from the respective flush water outlet opening first flows virtually “freely”, before it is “caught” as it were at a certain, predetermined distance by the flush water outlet opening and is conducted at a specific level into and around the sanitary bowl. Such a predetermined distance can lie according to the invention in a range from 0.1 cm to 15 cm, preferably in a range from 1 cm to 10 cm and particularly preferably in a range from 1.5 cm to 5 cm. Such an embodiment enables in an inventive way a bifurcated tangential flushing of the toilet bowl, wherein it is defined, by the distance of the water guiding device from the flush water outlet opening, how much flush water is to be conducted via the water guiding device and how much flush water is to be conducted directly into the regions of the toilet bowl lying beneath the water guiding device and at what angle the separation of the respective flush water flows is to take place. Said angle can also be set via an end of the water guiding device that is facing in the respective flush water outlet opening.

According to the invention, the free cross-section of the first flush water opening lies in a range from 4 mm to 35 mm, preferably in a range from 10 mm to 32 mm, and particularly preferably in a range from 15 mm to 30 mm, and the free cross-section of the second flush water opening lies in a range from 4 mm to 35 mm, preferably in a range from 4 mm to 15 mm, and particularly preferably in a range from 4 mm to 12 mm, wherein the quantity of the flush water exiting from these flush water outlet openings can be adjusted by the selection of the size of the opening, or of the free cross-section of the flush water outlet openings. The flush water outlet openings can have a round or oval, but if desired also a polygonal cross-section, wherein in particular a very oval-shaped cross-section is particularly preferred for the polygonal flush water outlet opening.

Furthermore, the first and/or the second flush water outlet opening can comprise either a single outlet opening or, for example by means of a grid, be split up into a multiplicity of single outlet openings arranged separated from one another, but adjacent to one another. According to the invention, it is thus possible to fan out the exiting flush water in a jet-like manner and thus to wet the surface area of the inner surface of the toilet bowl acted upon by the flush water in a defined and selective manner.

According to a further embodiment of the invention, the flush water outlet is constituted as a flush water distributor, which is integrated into the toilet unit. This embodiment makes it possible to constitute the flush water distributor integral with the toilet unit and to integrate the latter perfectly into the toilet unit, which is preferable particularly from the design standpoint. According to a preferred embodiment of the invention, the flush water distributor is integrated into the toilet unit in the form of a prefabricated component.

According to the invention, the prefabricated component is preferably produced from a ceramic material, introduced in the green state into the ceramic material provided for the production of the sanitary installation and positioned with a precise fit therein and then fired and optionally finally treated together with the ceramic material provided for the production of the sanitary installation.

The decisive advantage of such a flush water distributor, or such a water supply device, which is present or used in the form of a prefabricated component, consists in the fact that this prefabricated component can be produced in a separate production process with a very high degree of precision and enables an extremely precise division of the flush water and/or guidance of the flush water.

The flush toilet according to the invention thus enables optimum flushing of the sanitary bowl and an optimum removal of any residues from the toilet bowl, since the latter can be acted upon in a targeted manner by the flush water, which flows according to a precisely predefined flow pattern out of the flush water distributor into the sanitary bowl, without disruptions and/or undesired turbulence occurring in the flush water flow.

According to the invention, the flush water distributor can be formed from a first hollow element and a second hollow element connected to the first hollow element, wherein the first and the second hollow element jointly form a fluid channel, which emerges into two fluid outlet openings pointing in different directions, which respectively form the first flush water outlet opening and the second flush water outlet opening, and wherein the flush water distributor further comprises a fluid inlet opening, which communicates with the fluid channel and which is a flush water inlet opening.

The embodiment of the flush water distributor as a prefabricated part, which is composed of hollow elements which have been either subsequently joined together or directly produced in one piece to create the prefabricated component, offers the decisive inventive advantage that these hollow elements on the one hand can be produced easily and with great dimensional accuracy and moreover can be combined with one another in an extremely flexible manner, so that a fluid channel or a plurality of fluid channels can be formed, which are constituted either very simply and largely linear, or in a very complex way and provided with bends and curves. In this way, even complicated flush water supply devices can thus be produced in a straightforward manner and yet very precisely, which are then installed in the flush toilet according to the invention and integrated into the latter. It should be pointed out that the flush water distributor used according to the invention can also comprise more than two flush water outlet openings.

A further not insignificant advantage of the inventive use of a flush water distributor constituted as a prefabricated component also consists in the fact that such a flush water distributor can be arranged very close to the wall with respect to the inner surface of the toilet bowl in the toilet unit, so that the flush liquid exiting from the flush water outlet openings can be conducted in the optimum manner and with an almost laminar flow tangential to the inner side of the toilet bowl, which contributes to a further inventively improved flushing of the flush toilet according to the invention.

As an alternative to this embodiment, the flush water outlet can also be constituted as a flush water distributor, which can be attached to the main flush water opening which is provided in the toilet unit and which opens in the direction of the toilet bowl. Such a flush water distributor can thus optionally be attached subsequently to a toilet unit and/or exchanged. This has the advantage that, if desired, a flush water distributor adapted to the needs of the user can be used.

According to the invention, the flush water distributor has a width extension in the range from 30 mm to 70 mm, preferably in the range from 30 mm to 50 mm and particularly preferably in the range from 35 mm to 40 mm, and a depth extension in the range from 30 mm to 50 mm, preferably in the range from 30 mm to 40 mm and particularly preferably in the range from 35 mm to 40 mm, wherein the first and the second flush water outlet opening are spaced 30 mm to 80 mm, preferably 40 mm to 70 mm and particularly preferably 55 mm to 65 mm from one another, related to their closest edges facing one another.

As already mentioned, the flushing system according to the invention is particularly well suited for a “rimless” flush toilet.

To sum up, the essence of the invention can thus be set out as follows:

The water distributor according to the invention is constituted compact and discharges the flush water in two opposite directions. The main flush water is conducted forwards from a large outlet and a small jet of flush water is conducted backwards, in order to clean the surface of the inner side of the toilet bowl in this region which is usually neglected. The main flow flows with an opposite flow direction against the smaller flow, and the effect of the individual flush water flows meeting is that the combined flush water flow is conducted, or guided, into the siphon, wherein a specific direction can be controlled by geometrical factors of the water distributor itself.

The toilet is connected to a water source, such as for example a water tank, by a water inlet. The water inlet, which is usually arranged centrally relative to the toilet unit, is connected for this purpose to a water channel, which is hidden in the ceramic behind the surface of the WC bowl. The water flows through the water inlet into the water channel to the water distributor used according to the invention, where the water flow is divided and flows into the WC bowl through the two flush water outlet openings of differing size. The large flush water outlet opening is located on the upper side of the toilet bowl and conducts a large part of the flush water forwards, inclined tangentially into the toilet bowl, wherein the flush water thereby flows around the inner side of the toilet bowl along an edge running laterally at the inner side of the toilet bowl. A part of this flush water permanently loses flow energy and flows downwards at the inner side walls of the toilet bowl, and thereby cleans the latter. According to the invention, the edge tapers to zero before it reaches the rear wall of the toilet bowl. According to an alternative embodiment of the invention, the edge or the ledge can also extend completely and with the same thickness around the entire inner surface of the toilet bowl. An embodiment without such an edge and without such a ledge is also possible according to the invention. The small flush water jet directed backwards is designed for flushing the toilet bowl especially in this region and possibly does not require an edge or a ledge.

The small flush water outlet opening is located in the rear upper part of the toilet bowl and conducts the water out against the main flow. A bend is provided in the interior in the water distributor, in order to deflect the flush water flow backwards in the direction of the rear inner surface of the toilet bowl. A small water jet thus enters tangentially along the smooth, rear part of the toilet bowl. This is the part of the toilet bowl which usually cannot be cleaned with a normal water distributor or can be so only with the constantly falling main water flow.

The water distributor, insofar as the latter projects out of the toilet unit, is approximately 35 mm high, 40 mm wide and 35 mm deep. The two holes are arranged at a distance of approximately 60 mm and have an inner angle of 110 degrees.

The position of the distributor is located approximately 60 degrees offset in the toilet bowl, and more precisely related to a centre line which extends from front to rear relative to the toilet bowl.

The two flush water flows meet one another, and the small flow effectively prevents the main flow from continuing to flow around the toilet bowl, and thereby causes the flush water to be conducted into the siphon. The entire flush water flow that is conducted into the siphon then brings about the siphon flushing.

To put it briefly, the water distributor divides the respective flushing points of emphasis and conveys the flush water flow around in such a way that the inner side of the toilet bowl and the components located in the toilet bowl are cleaned in the optimum manner.

The main advantages of the invention therefore consist in

-   -   a compact construction, so that a surface of the inner side of         the toilet bowl that cannot be cleaned by flush water or can         only be so with difficulty is minimised compared to previously         known flush toilets. This is achieved by a unique combination of         two flush water outlet openings aligned differently, in         particular working in opposite directions relative to the toilet         bowl, which flush water outlet openings are arranged at a small         distance of approximately 60 mm from one another;     -   an optimised change in direction for a water flow directed         backwards;     -   better surface cleaning of the rear part of the toilet with the         directed small flush water jet;     -   the control and guidance of the swirled-up main flush water into         the siphon for optimum siphon flushing; and     -   quieter flushing on account of the horizontal flushing direction         of the water exiting from the flush holes, and     -   finally, a clearer design of the rear side of the WC bowl.

Further embodiments of the invention emerge from the sub-claims.

The invention is described below on the basis of examples of embodiment, which are explained in greater detail with the aid of the illustrations. In the figures:

FIG. 1 shows a diagrammatic representation of the structure and the mode of functioning of the inventive flush toilet according to an embodiment of the invention; and

FIG. 2 shows a diagrammatic representation of the inventive flush toilet according to the embodiment shown in FIG. 1.

The same reference numbers are used for identical and identically acting parts in the following description.

FIG. 1 shows a diagrammatic representation of the structure and the mode of functioning of flush toilet 10 according to the invention. Flush toilet 10 comprises a toilet unit 30, which comprises a toilet bowl 20. Furthermore, flush toilet 10 comprises a flush water outlet 40, which is arranged in a rear lateral corner region of the toilet bowl 20 and from which flush water can pour into toilet bowl 20. Flush water outlet 40, from its part, comprises the first flush water outlet opening 42, from which flush water can flow out in the direction of a first initial flushing direction 52 along a lateral inner side wall 62 of toilet bowl 20. Furthermore, flush water outlet 40 comprises a second flush water outlet opening 44, from which flush water can flow out in the direction of a second initial flushing direction 54 along a rear inner side wall 64 of toilet bowl 20. The flush flow flowing out of first flush water outlet opening 42 circulates along lateral inner side wall 62 assigned to first flush water outlet opening 42 in the direction of the front inner side wall of toilet bowl 20 and then in the direction of the opposite lateral inner side wall of toilet bowl 20. In contrast, the flush flow flowing out of second flush water opening 44 flows, corresponding to second initial flushing direction 54, proceeding from second flush water outlet opening along rear inner side wall 64 in the direction of the opposite inner side wall of toilet bowl 20, where the flush water flow flowing out of first flush water outlet opening 42 meets second flush water flow flowing out of second flush water outlet opening 44 and, as a result of this meeting, is deflected in each case downwards, i.e. in the direction of the siphon.

As emerges both from FIG. 1 and also FIG. 2, first flush water outlet opening 42 and second flush water outlet opening 44 are each directly adjoined by a ledge 80 constituted as a shoulder 80′, which in each case is constituted such that flush water flowing out of the respective flush water outlet opening first flows above and/or on the respective shoulder and thus first remains, against the force of gravity, in the upper region of toilet bowl 20 and, only at a certain distance from the respective flush water outlet opening, circulates with a downward tendency through toilet bowl 20. Respective shoulder 80′, or ledge 80 formed by shoulder 80′, tapers, in particular with respect to its width, i.e. its radial extension, with an increasing distance from the respective flush water outlet opening and extends, in the case of shoulder 80′ adjoining the first flush water outlet opening, over a region from a third up to a half of lateral inner side wall 62 and, in the case of shoulder 80′ adjoining second flush water outlet opening 44, over a region of approximately a sixth up to a quarter of the length of rear inner side wall 64.

At this point, it should be mentioned that all the parts described above, viewed alone or in any combination, in particular the details represented in the drawings, are claimed as being essential for the invention. Modifications thereto are familiar to the person skilled in the art.

LIST OF REFERENCE NUMBERS

10 flush toilet

20 toilet bowl

30 toilet unit

40 flush water outlet

42 first flush water outlet opening

44 second flush water outlet opening

50 centre line

52 first initial flushing direction

54 second initial flushing direction

60 front end

62 lateral inner side wall

64 rear inner side wall

70 rear end

80 ledge

80′ shoulder 

1. A flush toilet with a toilet bowl, comprising a toilet unit and a flush water outlet, via which flush water is delivered into the toilet unit, wherein the flush water outlet is arranged asymmetrically relative to an imaginary centre line, which extends essentially centrally from a front end of the toilet unit facing a user during the flushing operation to an opposite essentially central rear end of the toilet unit, in a rear lateral region, in particular in a rear lateral corner region, of the toilet bowl.
 2. The flush toilet according to claim 1, wherein the flush water outlet comprises at least a first flush water outlet opening, through which flush water can be delivered in a first initial flushing direction, and at least a second flush water outlet opening, through which flush water can be delivered in a second initial flushing direction.
 3. The flush toilet according to claim 2, wherein a free cross-section of the first flush water outlet opening is larger than a free cross-section of the second flush water outlet opening.
 4. The flush toilet according to claim 2, wherein the first and/or the second initial flushing direction extend in an essentially horizontal direction of ±0° to 5° relative to a horizontal line.
 5. The flush toilet according to claim 2, wherein the first and the second initial flushing direction are orientated with respect to one another at an angle in the range from 20° to 170°, preferably at an angle in the range from 45° to 140°, and particularly preferably at angle in the range from 70° to 130°.
 6. The flush toilet according to claim 2, wherein flush water that is delivered through the first flush water outlet opening initially flows along a lateral inner side wall of the toilet bowl, and that flush water that is delivered through the second flush water outlet opening initially flows along a rear inner side wall of the toilet bowl.
 7. The flush toilet according to claim 2, wherein the flush water exiting from the first flush water outlet opening and/or the flush water exiting from the second flush water outlet opening is conducted along a water guiding device arranged in the interior of the toilet bowl, in particular along a ledge, and/or along a shoulder arranged in the interior of the toilet bowl.
 8. The flush toilet according to claim 7, wherein the water guiding device tapers from an end close to the respective flush water outlet opening to an end remote from the respective flush water outlet opening, in particular down to zero.
 9. The flush toilet according to claim 7, wherein the water guiding device extends to a differing extent over the inner surface of the toilet bowl in the respect of the respective first flush water outlet opening and the second flush water outlet opening, wherein the water guiding device assigned to the first flush water outlet opening preferably extends from the first flush water outlet opening over at least a tenth up to a half or almost completely along the inner periphery of the toilet bowl in the direction of the rear inner side wall of the toilet bowl and wherein the water guiding device assigned to the second flush water outlet opening preferably extends from the second flush water outlet opening over essentially an eighth up to half the length of the rear inner side wall of the toilet bowl.
 10. The flush toilet according to claim 2, wherein the free cross-section of the first flush water opening lies in a range from 4 mm to 35 mm, preferably in a range from 10 mm to 32 mm, and particularly preferably in a range from 15 mm to 30 mm, and the free cross-section of the second flush water opening lies in a range from 4 mm to 35 mm, preferably in a range from 4 mm to 15 mm, and particularly preferably in a range from 4 mm to 12 mm.
 11. The flush toilet according to claim 10, wherein the flush water outlet is constituted as a flush water distributor and is integrated into the toilet unit in particular in the form of a prefabricated component.
 12. The sanitary installation according to claim 11, wherein the prefabricated component is produced from a ceramic material, introduced in the green state into the ceramic material provided for the production of the sanitary installation and is positioned with a precise fit therein and fired together with the ceramic material provided for the production of the sanitary installation and optionally finally treated.
 13. The flush toilet according to claim 12, wherein the flush water outlet can also be constituted as a flush water distributor, which can be attached to the main flush water opening which is provided in the toilet unit and which opens in the direction of the toilet bowl.
 14. The flush toilet according to claim 13, wherein the flush water distributor has a width extension in the range from 20 mm to 70 mm, preferably in the range from 25 mm to 50 mm and particularly preferably in the range from 35 mm to 45 mm and a depth extension in the range from 20 mm to 60 mm, preferably in the range from 25 mm to 50 mm and particularly preferably in the range from 25 mm to 45 mm, wherein the first and the second flush water outlet opening are spaced 20 mm to 80 mm, preferably 30 mm to 75 mm and particularly preferably 40 mm to 65 mm from one another, related to their closest edges facing one another.
 15. The flush toilet according to claim 14, wherein the flush water is a rimless toilet. 